植物功能群去除对内蒙古典型草原羊草群落土壤碳、氮库的影响  

Effects of plant functional groups removal on the soil carbon,nitrogen pools in a Leymus chinensis community of typical steppe in Inner Mongolia

作　　者：沙琼[1,2] 黄建辉[1] 白永飞[1] 韩兴国[1] 

机构地区：[1]中国科学院植物研究所植被与环境变化国家重点实验室,北京100093 [2]中国科学院研究生院,北京100049

出　　处：《应用生态学报》2009年第6期1305-1309,共5页Chinese Journal of Applied Ecology

基　　金：国家重点基础研究发展计划项目(2007CB106801)资助

摘　　要：2005—2007年,通过野外植物功能群去除试验,研究了内蒙古典型草原羊草群落植物多样性变化对土壤表层碳、氮库的影响.结果表明:典型草原生态系统表层土壤全碳、全氮含量年际变化较小(<15%),2005年的土壤全碳、全氮含量与2006、2007年无显著差异(P>0.05),但2006年的土壤全碳、全氮含量显著高于2007年(P<0.05);无机氮含量年际变化较大,2006年铵态氮含量比2007年高80%,差异显著(P<0.05),而硝态氮含量年变化不显著(P>0.05).去除植物功能群的数量和土壤硝态氮含量存在显著的线性正相关(P<0.05).说明植物物种多样性降低使土壤硝态氮含量增加,可能导致土壤氮的淋溶损失.A field plant functional groups （PFGs） removal experiment was conducted in 2005- 2007 to study the effects of plant diversity in a Leymus chinensis community of typical steppe in Inner Mongolia on the topsoil （0-10cm） carbon （C） and nitrogen （N） pools. In the three successive years, the topsoil total C and N contents had a slight change （ 〈 15% ）. They changed little in 2005, but were significantly higher in 2006 than in 2007 （P 〈 0. 05）. The topsoil NH4^＋ -N content had a greater inter-annual change, being 80% higher in 2006 than in 2007, while the NO3 -N content had less significant change （ P 〉 0. 05 ）. There was a positive linear relationship （ P 〈 0. 05 ） between the number of removed PFGs and the content of soil NO3 - -N, which meant that the decrease of plant diversity increased soil NO3 - -N content, and consequently, led to a possible soil nitrogen loss through leaching.

关 键 词：典型草原 全碳 全氮 铵态氮 硝态氮 植物功能群去除 

分 类 号：S812[农业科学—草业科学]